------- Comment #1 from jason at gcc dot gnu dot org 2009-01-06 19:47 ------- This was ill-formed under the proposal that was initially adopted, but was made well-formed in the March 2008 working paper when the following wording was struck from the end of 14.3:
A template-argument pack expansion shall not occur in a simple-template-id whose template-name refers to a class template unless the template-parameter-list of that class template declares a template parameter pack. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35722
